Color Settings

I have a KDS Tiger/Visual Sensation v5 and I can not get the settings to go above 640x480 and 16 Color. I have already tried to download the drivers, but they are of no use for some reason.
Another Note is that this computer that it is connected to had to be remade. Well, more like it had to have a new HD and a teacher did not want to loose all her data, so she requested that I put the origional HD from her old computer into a new one. That MIGHT have something to do with it. Before the switch, it was running just fine. Someone have input on this matter?